کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10626499 | 989686 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis of nanocrystalline cerium oxide particles by the precipitation method
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Effects of reaction temperature and atmosphere on properties of the CeO2 particles prepared by the precipitation technique, including particle size, shape, and crystalline structure were investigated. Also, the bandgap energies were estimated from the UV absorption spectra. Experimental results showed that the prepared particles were primary, non-porous and with cubic fluorite structure. The reaction temperature and oxygen content of O2/N2 atmosphere played important roles on the size and shape of resulting particles. The average particle size as well as the crystallite size increased with increasing the reaction temperature and decreasing the oxygen content. Besides, the particle shape transformed from square-like to hexagonal as the temperature was raised from 30 to 90 °C. In oxygen-lean atmosphere, the shape of all resulting particles was hexagonal, whereas needles mixed with hexagonal particles found at above 50% O2. Due to the quantum confinement effect, the bandgap energies of particles over the studied conditions approximately increased with decreasing particle size. However, the oxygen-induced shape change exhibited an exceptional deviation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 31, Issue 6, 2005, Pages 795-802
Journal: Ceramics International - Volume 31, Issue 6, 2005, Pages 795-802
نویسندگان
Huey-Ing Chen, Hung-Yi Chang,